<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
            .li_level1{
                float: left;
                width:200px;
                text-align: center
            }
        </style>
        <script>
            function init(){
                let abuttons=document.querySelectorAll(".btn_a");
                [...abuttons].forEach((item)=>{
                    item.addEventListener("click",(event)=>{
                        event.preventDefault();
                        let url=item.href.substring(item.href.lastIndexOf("/")+1);
                        console.log(url);
                        switch(url){
                            case "emp": 
                                document.getElementById("insertPoint").innerHTML="普通员工界面";
                                break;
                            case "manager" :
                                document.getElementById("insertPoint").innerHTML="管理员工界面";
                                break;
                        }
                        history.pushState({},"",url);
                    },false);
                });
            }
            window.addEventListener("load",init,false);
        </script>
    </head>
    <body>
            <ul style="list-style: none">
                <li class="li_level1"><a class="btn_a" href="emp">员工</a></li>
                <li class="li_level1"><a class="btn_a" href="manager">管理员</a></li>
            </ul>
            <br>
            <hr>
            <div id="insertPoint"></div>
        </body>
    </html>
    